Unstable problem with turning on the desktop

Question

Iron

The problem is the following. There is a desktop. When you press power, it supplies power to all the peripherals, but the speaker does not beep and post, apparently, does not start. However, after several reboots (from 3 to 50-70) it starts up and works.

Wherein:

• The dust is cleaned, there are no visually swollen capacitors. Also in the power supply.
• If it already started, then it works. During operation, it does not overheat, does not turn off. Holds a weekly uptime.
• Changing the battery doesn't help.
• Closing the jumper to clear the BIOS does not help. But the bios is erased.
• Disabling everything in a row, including memory, does not help. Well, that is, without memory, the situation is the same: the lights are on, the coolers and screws are turning, the speaker is silent.
• If it worked for a long time, and then rebooted, then it turns on normally when you reboot.
• Motherboard Asus p5k Black Pearl

What else to check?

Answer 1

Judging by the description, the root of evil is in a discharging / discharging capacitor or in cooling / heating elements. And this already means that the piece of iron almost dreamed of a fur-bearing animal, because this is far from being repaired by any hands. There are, in fact, quite a few options: either a power supply (if you're lucky) or a mother. By the way, starting the PSU cooler and supplying 5/12V does not yet mean its normal operation. Start by replacing the PSU.

Answer 2

What power supply? The motherboard may not be to blame if the problem is with the power supply

Answer 3

Of course, I'm sorry, but maybe the problem is in the Power button itself?
Weekly uptime somehow brushes aside all problems with hardware, imo.

Answer 4

Get another power supply from a neighbor for half an hour for a beer and check.

Answer 5

Update BIOS?

Answer 6

Take another mother and check with your iron. I had something similar. After several months (1-3 I don’t remember exactly), it stopped loading at all. The problem was with the mother.

Answer 7

This sometimes happens to me, after pulling out the RAM and connecting one at a time, everything starts working. If you haven't tried it yet, try it, maybe it will work for you.

Answer 8

in my opinion, the fact that the speaker is silent speaks just of a motherboard malfunction

Answer 9

Do you have USB 3.0 supported at the chipset level? If not, then you should try disabling the USB 3.0 ports in the BIOS.
I had such a problem, due to the curve implementation of 3.0.

Answer 10

Try changing the vidyuhu. I had the same symptoms, changing the graphics card helped